package src.com.fd.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class EncodingFilter implements Filter {
    // 定义默认字符雿
    private String encoding = "utf-8";
    public void init(FilterConfig filterConfig) throws ServletException {
    // 从web.xml文件中读取字符集;
    encoding = filterConfig.getInitParameter("encoding");
    }
    public void doFilter(ServletRequest request, ServletResponse response,
    FilterChain chain) throws IOException, ServletException {
    HttpServletRequest httpRequest = (HttpServletRequest) request;
    HttpServletResponse httpResponse = (HttpServletResponse) response;
    // 设置请求的字符集
    httpRequest.setCharacterEncoding(encoding);
    // 设置响应的字符集
    httpResponse.setCharacterEncoding(encoding);
    chain.doFilter(httpRequest, httpResponse);
    }

    @Override
    public void destroy() {

    }
}